Commitments and Contingencies (Details) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012 USD ($)	Mar. 31, 2012 BRL
Loss Contingency Abstract
Brazil VAT tax matter estimated loss - see footnote 11 for further information related to this matter	$ 205
Initial CADE civil fine imposed	1,200	2,200
Revised CADE civil fine	935	1,700
Percentage of guarantees to the Brazilian court satisfied by letters of credit related to CADE.	50.00%	50.00%
Percentage of guarantees to the Brazilian court satisfied by equity related to CADE	50.00%	50.00%
Former Gain Contingency Recognized In Current Period Net	$ 24

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant